🚀 go-pugleaf

	I've seen several references to digit pads which appear to be
part of a line card in a digital exchange.

	Are these basically a PROM or similar fitted ahead of the DAC in
the codec.  I assume they would have an input for the 8-bit PCM
code, a control input, and an 8-bit output to the DAC.  The PROM
would contain a lookup table which would translate the input
code to the equivalent PCM code for a particular loss which
would be set by a code fed to a control port on the PROM.

	That's a bit clumsy, but I hope you understanf what I mean.

	The net result would be the same as having a variable resistor
pad following the DAC.

	What is the range of loss available please?

	When would they be used to introduce a loss? All the time, or
only in special cases?

	I would appreciate any further help or information you can give.

			regards,  Alan.
.
  My correct mail address is amfowler@melbpc.org.au  
  Please delete anything between the "@" and "melbpc" when replying.   

  ,-._|\  Alan Fowler. (Alan M. Fowler  FIEAust CPEng)                     
 /  Oz  \ Mail Address: PO Box 1008G, North Balwyn 3104 Vic, AUSTRALIA.
 \_,--.x/ Phone: +613-9857-7128  Member, Melbourne PC User Group.
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